<?php

namespace App\Services\System;

use App\Models\System\SystemUserSchoolCampus;
use App\Services\BaseService;
use Illuminate\Pagination\LengthAwarePaginator;

/**
 * 系统用户校区关联服务类
 */
class SystemUserSchoolCampusService extends BaseService
{
    protected string $modelClass = SystemUserSchoolCampus::class;

    /**
     * 获取用户校区关联列表
     */
    public function getList(array $params): LengthAwarePaginator
    {
        $query = SystemUserSchoolCampus::query();

        // 用户ID筛选
        if (!empty($params['userid'])) {
            $query->where('userid', $params['userid']);
        }

        // 学校筛选
        if (!empty($params['schoolid'])) {
            $query->where('schoolid', $params['schoolid']);
        }

        // 校区筛选
        if (!empty($params['campusid'])) {
            $query->where('campusid', $params['campusid']);
        }

        // 包含关联信息
        $query->with([
            'user:id,username,nickname',
            'school:id,name,alias',
            'campus:id,name,alias'
        ]);

        // 排序
        $query->orderBy('schoolid', 'asc')
              ->orderBy('campusid', 'asc')
              ->orderBy('userid', 'asc');

        return $query->paginate($params['page_size'] ?? 15);
    }

    /**
     * 获取用户的学校校区列表
     */
    public function getUserSchoolCampuses(int $userId): array
    {
        return SystemUserSchoolCampus::where('userid', $userId)
            ->with([
                'school:id,name,alias',
                'campus:id,name,alias'
            ])
            ->get()
            ->toArray();
    }

    /**
     * 获取学校的用户列表
     */
    public function getSchoolUsers(int $schoolId): array
    {
        return SystemUserSchoolCampus::where('schoolid', $schoolId)
            ->with([
                'user:id,username,nickname',
                'campus:id,name,alias'
            ])
            ->get()
            ->toArray();
    }

    /**
     * 获取校区的用户列表
     */
    public function getCampusUsers(int $campusId): array
    {
        return SystemUserSchoolCampus::where('campusid', $campusId)
            ->with([
                'user:id,username,nickname',
                'school:id,name,alias'
            ])
            ->get()
            ->toArray();
    }

    /**
     * 批量分配用户到学校校区
     */
    public function batchAssignUsersToSchoolCampus(array $userIds, int $schoolId, ?int $campusId = null): array
    {
        $results = [];

        foreach ($userIds as $userId) {
            // 检查是否已经存在关联
            $exists = SystemUserSchoolCampus::where('userid', $userId)
                ->where('schoolid', $schoolId)
                ->where('campusid', $campusId ?? 0)
                ->exists();

            if (!$exists) {
                $data = [
                    'userid' => $userId,
                    'schoolid' => $schoolId,
                    'campusid' => $campusId ?? 0,
                ];

                $result = $this->create($data);
                $results[] = $result;
            }
        }

        return $results;
    }

    /**
     * 批量移除用户学校校区关联
     */
    public function batchRemoveUsersFromSchoolCampus(array $userIds, int $schoolId, ?int $campusId = null): int
    {
        $query = SystemUserSchoolCampus::whereIn('userid', $userIds)
            ->where('schoolid', $schoolId);

        if ($campusId !== null) {
            $query->where('campusid', $campusId);
        }

        return $query->delete();
    }

    /**
     * 转移用户到新的学校校区
     */
    public function transferUserToSchoolCampus(int $userId, int $oldSchoolId, int $newSchoolId, ?int $oldCampusId = null, ?int $newCampusId = null): bool
    {
        // 删除旧的关联
        $deleteQuery = SystemUserSchoolCampus::where('userid', $userId)
            ->where('schoolid', $oldSchoolId);

        if ($oldCampusId !== null) {
            $deleteQuery->where('campusid', $oldCampusId);
        }

        $deleteQuery->delete();

        // 创建新的关联
        $data = [
            'userid' => $userId,
            'schoolid' => $newSchoolId,
            'campusid' => $newCampusId ?? 0,
        ];

        $this->create($data);

        return true;
    }

    /**
     * 获取用户管理的学校ID列表
     */
    public function getUserSchoolIds(int $userId): array
    {
        return SystemUserSchoolCampus::where('userid', $userId)
            ->pluck('schoolid')
            ->unique()
            ->toArray();
    }

    /**
     * 获取用户管理的校区ID列表
     */
    public function getUserCampusIds(int $userId): array
    {
        return SystemUserSchoolCampus::where('userid', $userId)
            ->pluck('campusid')
            ->toArray();
    }

    /**
     * 检查用户是否管理指定学校
     */
    public function checkUserManagesSchool(int $userId, int $schoolId): bool
    {
        return SystemUserSchoolCampus::where('userid', $userId)
            ->where('schoolid', $schoolId)
            ->exists();
    }

    /**
     * 检查用户是否管理指定校区
     */
    public function checkUserManagesCampus(int $userId, int $campusId): bool
    {
        return SystemUserSchoolCampus::where('userid', $userId)
            ->where('campusid', $campusId)
            ->exists();
    }

    /**
     * 获取用户校区统计信息
     */
    public function getUserSchoolCampusStats(int $userId): array
    {
        $relations = SystemUserSchoolCampus::where('userid', $userId)
            ->with(['school:id,name', 'campus:id,name'])
            ->get();

        return [
            'total_schools' => $relations->pluck('school')->unique('id')->count(),
            'total_campuses' => $relations->where('campusid', '>', 0)->count(),
            'schools' => $relations->pluck('school')->unique('id')->values()->toArray(),
            'campuses' => $relations->where('campusid', '>', 0)->pluck('campus')->toArray(),
        ];
    }

    /**
     * 创建前的特殊处理
     */
    protected function beforeCreate(array &$data): void
    {
        // 设置默认值
        $data['campusid'] = $data['campusid'] ?? 0;

        // 验证用户是否存在
        if (!empty($data['userid'])) {
            $user = \App\Models\User::find($data['userid']);
            if (!$user) {
                throw new \InvalidArgumentException('指定的用户不存在');
            }
        }

        // 验证学校是否存在
        if (!empty($data['schoolid'])) {
            $school = \App\Models\Schools\School::find($data['schoolid']);
            if (!$school) {
                throw new \InvalidArgumentException('指定的学校不存在');
            }
        }

        // 验证校区是否存在
        if (!empty($data['campusid']) && $data['campusid'] > 0) {
            $campus = \App\Models\Schools\SchoolCampus::find($data['campusid']);
            if (!$campus) {
                throw new \InvalidArgumentException('指定的校区不存在');
            }

            // 验证校区是否属于指定学校
            if ($campus->school_id !== $data['schoolid']) {
                throw new \InvalidArgumentException('指定的校区不属于该学校');
            }
        }

        // 检查是否已经存在关联
        $exists = SystemUserSchoolCampus::where('userid', $data['userid'])
            ->where('schoolid', $data['schoolid'])
            ->where('campusid', $data['campusid'])
            ->exists();

        if ($exists) {
            throw new \InvalidArgumentException('该用户已经关联了此学校和校区');
        }
    }
}